void AddDateMarkerAnnoations (ShinobiChart chart)
{
// Read the annotations from a JSON file
JsonValue annotations = JsonObject.Load(new StreamReader("./Annotations.json"));
CGAffineTransform rotationTransform = CGAffineTransform.MakeRotation ((float)Math.PI / 2);
// create a line and text annotation for each 'date' marker on the chart
foreach (JsonValue annotation in annotations) {
// Extract the data for this annotation
NSDate date = dateFormatter.Parse (annotation ["date"]);
NSNumber yValue = (int)annotation ["y-location"];
NSString text = new NSString(annotation ["annotation"]);
// Add a vertical line annotation
SChartAnnotation releaseAnnotation = SChartAnnotation.GetVerticalLine (date, chart.XAxis, chart.YAxis, 2, UIColor.FromWhiteAlpha (0.7f, 1));
releaseAnnotation.Position = SChartAnnotationPosition.AboveData;
chart.AddAnnotation (releaseAnnotation);
// Add a text annotation
SChartAnnotation releaseLabel = SChartAnnotation.GetAnnotation (text, UIFont.SystemFontOfSize(14), chart.XAxis, chart.YAxis, date, yValue, UIColor.Black, chart.PlotBackgroundColor);
//Rotate the text by 90 degrees
releaseLabel.Transform = rotationTransform;
releaseLabel.Position = SChartAnnotationPosition.AboveData;
chart.AddAnnotation (releaseLabel);
}
}
void AddCustomAnnotation(ShinobiChart chart)
{
// Create an annotation
SChartAnnotationZooming an = new SChartAnnotationZooming {
XAxis = chart.XAxis,
YAxis = chart.YAxis,
// Set its location - using the data coordinate system
XValue = dateFormatter.Parse ("01-01-2009"),
YValue = new NSNumber(250),
// Pin all four corners of the annotation so that it stretches
XValueMax = dateFormatter.Parse ("01-01-2011"),
YValueMax = new NSNumber(550),
// Set bounds
Bounds = new CGRect (0, 0, 50, 50),
Position = SChartAnnotationPosition.BelowData
};
// Add some custom content to the annotation
UIImage image = new UIImage ("Apple.png");
UIImageView imageView = new UIImageView (image) { Alpha = 0.1f };
an.AddSubview (imageView);
// Add to the chart
chart.AddAnnotation (an);
}